18.5.3 @inlineifset and @inlineifclear

@inlineifset and @inlineifclear provide
brace-delimited alternatives to the @ifset and
@ifclear forms, similar to the other @inline...
Commands (see Inline Conditionals). The same caveats about
argument parsing given there apply here too.

@inlineifset{var, text}

Process the Texinfo text if the flag var is defined.

@inlineifclear{var, text}

Process the Texinfo text if the flag var is not defined.

Except for the syntax, their general behavior and purposes is the same
as with @ifset and @ifclear, described in the previous
section.